diff options
Diffstat (limited to 'drivers/rtc/rtc-ds1511.c')
-rw-r--r-- | drivers/rtc/rtc-ds1511.c | 656 |
1 files changed, 656 insertions, 0 deletions
diff --git a/drivers/rtc/rtc-ds1511.c b/drivers/rtc/rtc-ds1511.c new file mode 100644 index 000000000000..d74b8086fa31 --- /dev/null +++ b/drivers/rtc/rtc-ds1511.c | |||
@@ -0,0 +1,656 @@ | |||
1 | /* | ||
2 | * An rtc driver for the Dallas DS1511 | ||
3 | * | ||
4 | * Copyright (C) 2006 Atsushi Nemoto <anemo@mba.ocn.ne.jp> | ||
5 | * Copyright (C) 2007 Andrew Sharp <andy.sharp@onstor.com> | ||
6 | * | ||
7 | * This program is free software; you can redistribute it and/or modify | ||
8 | * it under the terms of the GNU General Public License version 2 as | ||
9 | * published by the Free Software Foundation. | ||
10 | * | ||
11 | * Real time clock driver for the Dallas 1511 chip, which also | ||
12 | * contains a watchdog timer. There is a tiny amount of code that | ||
13 | * platform code could use to mess with the watchdog device a little | ||
14 | * bit, but not a full watchdog driver. | ||
15 | */ | ||
16 | |||
17 | #include <linux/bcd.h> | ||
18 | #include <linux/init.h> | ||
19 | #include <linux/kernel.h> | ||
20 | #include <linux/delay.h> | ||
21 | #include <linux/interrupt.h> | ||
22 | #include <linux/rtc.h> | ||
23 | #include <linux/platform_device.h> | ||
24 | #include <linux/io.h> | ||
25 | |||
26 | #define DRV_VERSION "0.6" | ||
27 | |||
28 | enum ds1511reg { | ||
29 | DS1511_SEC = 0x0, | ||
30 | DS1511_MIN = 0x1, | ||
31 | DS1511_HOUR = 0x2, | ||
32 | DS1511_DOW = 0x3, | ||
33 | DS1511_DOM = 0x4, | ||
34 | DS1511_MONTH = 0x5, | ||
35 | DS1511_YEAR = 0x6, | ||
36 | DS1511_CENTURY = 0x7, | ||
37 | DS1511_AM1_SEC = 0x8, | ||
38 | DS1511_AM2_MIN = 0x9, | ||
39 | DS1511_AM3_HOUR = 0xa, | ||
40 | DS1511_AM4_DATE = 0xb, | ||
41 | DS1511_WD_MSEC = 0xc, | ||
42 | DS1511_WD_SEC = 0xd, | ||
43 | DS1511_CONTROL_A = 0xe, | ||
44 | DS1511_CONTROL_B = 0xf, | ||
45 | DS1511_RAMADDR_LSB = 0x10, | ||
46 | DS1511_RAMDATA = 0x13 | ||
47 | }; | ||
48 | |||
49 | #define DS1511_BLF1 0x80 | ||
50 | #define DS1511_BLF2 0x40 | ||
51 | #define DS1511_PRS 0x20 | ||
52 | #define DS1511_PAB 0x10 | ||
53 | #define DS1511_TDF 0x08 | ||
54 | #define DS1511_KSF 0x04 | ||
55 | #define DS1511_WDF 0x02 | ||
56 | #define DS1511_IRQF 0x01 | ||
57 | #define DS1511_TE 0x80 | ||
58 | #define DS1511_CS 0x40 | ||
59 | #define DS1511_BME 0x20 | ||
60 | #define DS1511_TPE 0x10 | ||
61 | #define DS1511_TIE 0x08 | ||
62 | #define DS1511_KIE 0x04 | ||
63 | #define DS1511_WDE 0x02 | ||
64 | #define DS1511_WDS 0x01 | ||
65 | #define DS1511_RAM_MAX 0xff | ||
66 | |||
67 | #define RTC_CMD DS1511_CONTROL_B | ||
68 | #define RTC_CMD1 DS1511_CONTROL_A | ||
69 | |||
70 | #define RTC_ALARM_SEC DS1511_AM1_SEC | ||
71 | #define RTC_ALARM_MIN DS1511_AM2_MIN | ||
72 | #define RTC_ALARM_HOUR DS1511_AM3_HOUR | ||
73 | #define RTC_ALARM_DATE DS1511_AM4_DATE | ||
74 | |||
75 | #define RTC_SEC DS1511_SEC | ||
76 | #define RTC_MIN DS1511_MIN | ||
77 | #define RTC_HOUR DS1511_HOUR | ||
78 | #define RTC_DOW DS1511_DOW | ||
79 | #define RTC_DOM DS1511_DOM | ||
80 | #define RTC_MON DS1511_MONTH | ||
81 | #define RTC_YEAR DS1511_YEAR | ||
82 | #define RTC_CENTURY DS1511_CENTURY | ||
83 | |||
84 | #define RTC_TIE DS1511_TIE | ||
85 | #define RTC_TE DS1511_TE | ||
86 | |||
87 | struct rtc_plat_data { | ||
88 | struct rtc_device *rtc; | ||
89 | void __iomem *ioaddr; /* virtual base address */ | ||
90 | unsigned long baseaddr; /* physical base address */ | ||
91 | int size; /* amount of memory mapped */ | ||
92 | int irq; | ||
93 | unsigned int irqen; | ||
94 | int alrm_sec; | ||
95 | int alrm_min; | ||
96 | int alrm_hour; | ||
97 | int alrm_mday; | ||
98 | }; | ||
99 | |||
100 | static DEFINE_SPINLOCK(ds1511_lock); | ||
101 | |||
102 | static __iomem char *ds1511_base; | ||
103 | static u32 reg_spacing = 1; | ||
104 | |||
105 | static noinline void | ||
106 | rtc_write(uint8_t val, uint32_t reg) | ||
107 | { | ||
108 | writeb(val, ds1511_base + (reg * reg_spacing)); | ||
109 | } | ||
110 | |||
111 | static inline void | ||
112 | rtc_write_alarm(uint8_t val, enum ds1511reg reg) | ||
113 | { | ||
114 | rtc_write((val | 0x80), reg); | ||
115 | } | ||
116 | |||
117 | static noinline uint8_t | ||
118 | rtc_read(enum ds1511reg reg) | ||
119 | { | ||
120 | return readb(ds1511_base + (reg * reg_spacing)); | ||
121 | } | ||
122 | |||
123 | static inline void | ||
124 | rtc_disable_update(void) | ||
125 | { | ||
126 | rtc_write((rtc_read(RTC_CMD) & ~RTC_TE), RTC_CMD); | ||
127 | } | ||
128 | |||
129 | static void | ||
130 | rtc_enable_update(void) | ||
131 | { | ||
132 | rtc_write((rtc_read(RTC_CMD) | RTC_TE), RTC_CMD); | ||
133 | } | ||
134 | |||
135 | /* | ||
136 | * #define DS1511_WDOG_RESET_SUPPORT | ||
137 | * | ||
138 | * Uncomment this if you want to use these routines in | ||
139 | * some platform code. | ||
140 | */ | ||
141 | #ifdef DS1511_WDOG_RESET_SUPPORT | ||
142 | /* | ||
143 | * just enough code to set the watchdog timer so that it | ||
144 | * will reboot the system | ||
145 | */ | ||
146 | void | ||
147 | ds1511_wdog_set(unsigned long deciseconds) | ||
148 | { | ||
149 | /* | ||
150 | * the wdog timer can take 99.99 seconds | ||
151 | */ | ||
152 | deciseconds %= 10000; | ||
153 | /* | ||
154 | * set the wdog values in the wdog registers | ||
155 | */ | ||
156 | rtc_write(BIN2BCD(deciseconds % 100), DS1511_WD_MSEC); | ||
157 | rtc_write(BIN2BCD(deciseconds / 100), DS1511_WD_SEC); | ||
158 | /* | ||
159 | * set wdog enable and wdog 'steering' bit to issue a reset | ||
160 | */ | ||
161 | rtc_write(DS1511_WDE | DS1511_WDS, RTC_CMD); | ||
162 | } | ||
163 | |||
164 | void | ||
165 | ds1511_wdog_disable(void) | ||
166 | { | ||
167 | /* | ||
168 | * clear wdog enable and wdog 'steering' bits | ||
169 | */ | ||
170 | rtc_write(rtc_read(RTC_CMD) & ~(DS1511_WDE | DS1511_WDS), RTC_CMD); | ||
171 | /* | ||
172 | * clear the wdog counter | ||
173 | */ | ||
174 | rtc_write(0, DS1511_WD_MSEC); | ||
175 | rtc_write(0, DS1511_WD_SEC); | ||
176 | } | ||
177 | #endif | ||
178 | |||
179 | /* | ||
180 | * set the rtc chip's idea of the time. | ||
181 | * stupidly, some callers call with year unmolested; | ||
182 | * and some call with year = year - 1900. thanks. | ||
183 | */ | ||
184 | int | ||
185 | ds1511_rtc_set_time(struct device *dev, struct rtc_time *rtc_tm) | ||
186 | { | ||
187 | u8 mon, day, dow, hrs, min, sec, yrs, cen; | ||
188 | unsigned int flags; | ||
189 | |||
190 | /* | ||
191 | * won't have to change this for a while | ||
192 | */ | ||
193 | if (rtc_tm->tm_year < 1900) { | ||
194 | rtc_tm->tm_year += 1900; | ||
195 | } | ||
196 | |||
197 | if (rtc_tm->tm_year < 1970) { | ||
198 | return -EINVAL; | ||
199 | } | ||
200 | yrs = rtc_tm->tm_year % 100; | ||
201 | cen = rtc_tm->tm_year / 100; | ||
202 | mon = rtc_tm->tm_mon + 1; /* tm_mon starts at zero */ | ||
203 | day = rtc_tm->tm_mday; | ||
204 | dow = rtc_tm->tm_wday & 0x7; /* automatic BCD */ | ||
205 | hrs = rtc_tm->tm_hour; | ||
206 | min = rtc_tm->tm_min; | ||
207 | sec = rtc_tm->tm_sec; | ||
208 | |||
209 | if ((mon > 12) || (day == 0)) { | ||
210 | return -EINVAL; | ||
211 | } | ||
212 | |||
213 | if (day > rtc_month_days(rtc_tm->tm_mon, rtc_tm->tm_year)) { | ||
214 | return -EINVAL; | ||
215 | } | ||
216 | |||
217 | if ((hrs >= 24) || (min >= 60) || (sec >= 60)) { | ||
218 | return -EINVAL; | ||
219 | } | ||
220 | |||
221 | /* | ||
222 | * each register is a different number of valid bits | ||
223 | */ | ||
224 | sec = BIN2BCD(sec) & 0x7f; | ||
225 | min = BIN2BCD(min) & 0x7f; | ||
226 | hrs = BIN2BCD(hrs) & 0x3f; | ||
227 | day = BIN2BCD(day) & 0x3f; | ||
228 | mon = BIN2BCD(mon) & 0x1f; | ||
229 | yrs = BIN2BCD(yrs) & 0xff; | ||
230 | cen = BIN2BCD(cen) & 0xff; | ||
231 | |||
232 | spin_lock_irqsave(&ds1511_lock, flags); | ||
233 | rtc_disable_update(); | ||
234 | rtc_write(cen, RTC_CENTURY); | ||
235 | rtc_write(yrs, RTC_YEAR); | ||
236 | rtc_write((rtc_read(RTC_MON) & 0xe0) | mon, RTC_MON); | ||
237 | rtc_write(day, RTC_DOM); | ||
238 | rtc_write(hrs, RTC_HOUR); | ||
239 | rtc_write(min, RTC_MIN); | ||
240 | rtc_write(sec, RTC_SEC); | ||
241 | rtc_write(dow, RTC_DOW); | ||
242 | rtc_enable_update(); | ||
243 | spin_unlock_irqrestore(&ds1511_lock, flags); | ||
244 | |||
245 | return 0; | ||
246 | } | ||
247 | |||
248 | int | ||
249 | ds1511_rtc_read_time(struct device *dev, struct rtc_time *rtc_tm) | ||
250 | { | ||
251 | unsigned int century; | ||
252 | unsigned int flags; | ||
253 | |||
254 | spin_lock_irqsave(&ds1511_lock, flags); | ||
255 | rtc_disable_update(); | ||
256 | |||
257 | rtc_tm->tm_sec = rtc_read(RTC_SEC) & 0x7f; | ||
258 | rtc_tm->tm_min = rtc_read(RTC_MIN) & 0x7f; | ||
259 | rtc_tm->tm_hour = rtc_read(RTC_HOUR) & 0x3f; | ||
260 | rtc_tm->tm_mday = rtc_read(RTC_DOM) & 0x3f; | ||
261 | rtc_tm->tm_wday = rtc_read(RTC_DOW) & 0x7; | ||
262 | rtc_tm->tm_mon = rtc_read(RTC_MON) & 0x1f; | ||
263 | rtc_tm->tm_year = rtc_read(RTC_YEAR) & 0x7f; | ||
264 | century = rtc_read(RTC_CENTURY); | ||
265 | |||
266 | rtc_enable_update(); | ||
267 | spin_unlock_irqrestore(&ds1511_lock, flags); | ||
268 | |||
269 | rtc_tm->tm_sec = BCD2BIN(rtc_tm->tm_sec); | ||
270 | rtc_tm->tm_min = BCD2BIN(rtc_tm->tm_min); | ||
271 | rtc_tm->tm_hour = BCD2BIN(rtc_tm->tm_hour); | ||
272 | rtc_tm->tm_mday = BCD2BIN(rtc_tm->tm_mday); | ||
273 | rtc_tm->tm_wday = BCD2BIN(rtc_tm->tm_wday); | ||
274 | rtc_tm->tm_mon = BCD2BIN(rtc_tm->tm_mon); | ||
275 | rtc_tm->tm_year = BCD2BIN(rtc_tm->tm_year); | ||
276 | century = BCD2BIN(century) * 100; | ||
277 | |||
278 | /* | ||
279 | * Account for differences between how the RTC uses the values | ||
280 | * and how they are defined in a struct rtc_time; | ||
281 | */ | ||
282 | century += rtc_tm->tm_year; | ||
283 | rtc_tm->tm_year = century - 1900; | ||
284 | |||
285 | rtc_tm->tm_mon--; | ||
286 | |||
287 | if (rtc_valid_tm(rtc_tm) < 0) { | ||
288 | dev_err(dev, "retrieved date/time is not valid.\n"); | ||
289 | rtc_time_to_tm(0, rtc_tm); | ||
290 | } | ||
291 | return 0; | ||
292 | } | ||
293 | |||
294 | /* | ||
295 | * write the alarm register settings | ||
296 | * | ||
297 | * we only have the use to interrupt every second, otherwise | ||
298 | * known as the update interrupt, or the interrupt if the whole | ||
299 | * date/hours/mins/secs matches. the ds1511 has many more | ||
300 | * permutations, but the kernel doesn't. | ||
301 | */ | ||
302 | static void | ||
303 | ds1511_rtc_update_alarm(struct rtc_plat_data *pdata) | ||
304 | { | ||
305 | unsigned long flags; | ||
306 | |||
307 | spin_lock_irqsave(&pdata->rtc->irq_lock, flags); | ||
308 | rtc_write(pdata->alrm_mday < 0 || (pdata->irqen & RTC_UF) ? | ||
309 | 0x80 : BIN2BCD(pdata->alrm_mday) & 0x3f, | ||
310 | RTC_ALARM_DATE); | ||
311 | rtc_write(pdata->alrm_hour < 0 || (pdata->irqen & RTC_UF) ? | ||
312 | 0x80 : BIN2BCD(pdata->alrm_hour) & 0x3f, | ||
313 | RTC_ALARM_HOUR); | ||
314 | rtc_write(pdata->alrm_min < 0 || (pdata->irqen & RTC_UF) ? | ||
315 | 0x80 : BIN2BCD(pdata->alrm_min) & 0x7f, | ||
316 | RTC_ALARM_MIN); | ||
317 | rtc_write(pdata->alrm_sec < 0 || (pdata->irqen & RTC_UF) ? | ||
318 | 0x80 : BIN2BCD(pdata->alrm_sec) & 0x7f, | ||
319 | RTC_ALARM_SEC); | ||
320 | rtc_write(rtc_read(RTC_CMD) | (pdata->irqen ? RTC_TIE : 0), RTC_CMD); | ||
321 | rtc_read(RTC_CMD1); /* clear interrupts */ | ||
322 | spin_unlock_irqrestore(&pdata->rtc->irq_lock, flags); | ||
323 | } | ||
324 | |||
325 | static int | ||
326 | ds1511_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alrm) | ||
327 | { | ||
328 | struct platform_device *pdev = to_platform_device(dev); | ||
329 | struct rtc_plat_data *pdata = platform_get_drvdata(pdev); | ||
330 | |||
331 | if (pdata->irq < 0) { | ||
332 | return -EINVAL; | ||
333 | } | ||
334 | pdata->alrm_mday = alrm->time.tm_mday; | ||
335 | pdata->alrm_hour = alrm->time.tm_hour; | ||
336 | pdata->alrm_min = alrm->time.tm_min; | ||
337 | pdata->alrm_sec = alrm->time.tm_sec; | ||
338 | if (alrm->enabled) { | ||
339 | pdata->irqen |= RTC_AF; | ||
340 | } | ||
341 | ds1511_rtc_update_alarm(pdata); | ||
342 | return 0; | ||
343 | } | ||
344 | |||
345 | static int | ||
346 | ds1511_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alrm) | ||
347 | { | ||
348 | struct platform_device *pdev = to_platform_device(dev); | ||
349 | struct rtc_plat_data *pdata = platform_get_drvdata(pdev); | ||
350 | |||
351 | if (pdata->irq < 0) { | ||
352 | return -EINVAL; | ||
353 | } | ||
354 | alrm->time.tm_mday = pdata->alrm_mday < 0 ? 0 : pdata->alrm_mday; | ||
355 | alrm->time.tm_hour = pdata->alrm_hour < 0 ? 0 : pdata->alrm_hour; | ||
356 | alrm->time.tm_min = pdata->alrm_min < 0 ? 0 : pdata->alrm_min; | ||
357 | alrm->time.tm_sec = pdata->alrm_sec < 0 ? 0 : pdata->alrm_sec; | ||
358 | alrm->enabled = (pdata->irqen & RTC_AF) ? 1 : 0; | ||
359 | return 0; | ||
360 | } | ||
361 | |||
362 | static irqreturn_t | ||
363 | ds1511_interrupt(int irq, void *dev_id) | ||
364 | { | ||
365 | struct platform_device *pdev = dev_id; | ||
366 | struct rtc_plat_data *pdata = platform_get_drvdata(pdev); | ||
367 | unsigned long events = RTC_IRQF; | ||
368 | |||
369 | /* | ||
370 | * read and clear interrupt | ||
371 | */ | ||
372 | if (!(rtc_read(RTC_CMD1) & DS1511_IRQF)) { | ||
373 | return IRQ_NONE; | ||
374 | } | ||
375 | if (rtc_read(RTC_ALARM_SEC) & 0x80) { | ||
376 | events |= RTC_UF; | ||
377 | } else { | ||
378 | events |= RTC_AF; | ||
379 | } | ||
380 | rtc_update_irq(pdata->rtc, 1, events); | ||
381 | return IRQ_HANDLED; | ||
382 | } | ||
383 | |||
384 | static void | ||
385 | ds1511_rtc_release(struct device *dev) | ||
386 | { | ||
387 | struct platform_device *pdev = to_platform_device(dev); | ||
388 | struct rtc_plat_data *pdata = platform_get_drvdata(pdev); | ||
389 | |||
390 | if (pdata->irq >= 0) { | ||
391 | pdata->irqen = 0; | ||
392 | ds1511_rtc_update_alarm(pdata); | ||
393 | } | ||
394 | } | ||
395 | |||
396 | static int | ||
397 | ds1511_rtc_ioctl(struct device *dev, unsigned int cmd, unsigned long arg) | ||
398 | { | ||
399 | struct platform_device *pdev = to_platform_device(dev); | ||
400 | struct rtc_plat_data *pdata = platform_get_drvdata(pdev); | ||
401 | |||
402 | if (pdata->irq < 0) { | ||
403 | return -ENOIOCTLCMD; /* fall back into rtc-dev's emulation */ | ||
404 | } | ||
405 | switch (cmd) { | ||
406 | case RTC_AIE_OFF: | ||
407 | pdata->irqen &= ~RTC_AF; | ||
408 | ds1511_rtc_update_alarm(pdata); | ||
409 | break; | ||
410 | case RTC_AIE_ON: | ||
411 | pdata->irqen |= RTC_AF; | ||
412 | ds1511_rtc_update_alarm(pdata); | ||
413 | break; | ||
414 | case RTC_UIE_OFF: | ||
415 | pdata->irqen &= ~RTC_UF; | ||
416 | ds1511_rtc_update_alarm(pdata); | ||
417 | break; | ||
418 | case RTC_UIE_ON: | ||
419 | pdata->irqen |= RTC_UF; | ||
420 | ds1511_rtc_update_alarm(pdata); | ||
421 | break; | ||
422 | default: | ||
423 | return -ENOIOCTLCMD; | ||
424 | } | ||
425 | return 0; | ||
426 | } | ||
427 | |||
428 | static const struct rtc_class_ops ds1511_rtc_ops = { | ||
429 | .read_time = ds1511_rtc_read_time, | ||
430 | .set_time = ds1511_rtc_set_time, | ||
431 | .read_alarm = ds1511_rtc_read_alarm, | ||
432 | .set_alarm = ds1511_rtc_set_alarm, | ||
433 | .release = ds1511_rtc_release, | ||
434 | .ioctl = ds1511_rtc_ioctl, | ||
435 | }; | ||
436 | |||
437 | static ssize_t | ||
438 | ds1511_nvram_read(struct kobject *kobj, struct bin_attribute *ba, | ||
439 | char *buf, loff_t pos, size_t size) | ||
440 | { | ||
441 | ssize_t count; | ||
442 | |||
443 | /* | ||
444 | * if count is more than one, turn on "burst" mode | ||
445 | * turn it off when you're done | ||
446 | */ | ||
447 | if (size > 1) { | ||
448 | rtc_write((rtc_read(RTC_CMD) | DS1511_BME), RTC_CMD); | ||
449 | } | ||
450 | if (pos > DS1511_RAM_MAX) { | ||
451 | pos = DS1511_RAM_MAX; | ||
452 | } | ||
453 | if (size + pos > DS1511_RAM_MAX + 1) { | ||
454 | size = DS1511_RAM_MAX - pos + 1; | ||
455 | } | ||
456 | rtc_write(pos, DS1511_RAMADDR_LSB); | ||
457 | for (count = 0; size > 0; count++, size--) { | ||
458 | *buf++ = rtc_read(DS1511_RAMDATA); | ||
459 | } | ||
460 | if (count > 1) { | ||
461 | rtc_write((rtc_read(RTC_CMD) & ~DS1511_BME), RTC_CMD); | ||
462 | } | ||
463 | return count; | ||
464 | } | ||
465 | |||
466 | static ssize_t | ||
467 | ds1511_nvram_write(struct kobject *kobj, struct bin_attribute *bin_attr, | ||
468 | char *buf, loff_t pos, size_t size) | ||
469 | { | ||
470 | ssize_t count; | ||
471 | |||
472 | /* | ||
473 | * if count is more than one, turn on "burst" mode | ||
474 | * turn it off when you're done | ||
475 | */ | ||
476 | if (size > 1) { | ||
477 | rtc_write((rtc_read(RTC_CMD) | DS1511_BME), RTC_CMD); | ||
478 | } | ||
479 | if (pos > DS1511_RAM_MAX) { | ||
480 | pos = DS1511_RAM_MAX; | ||
481 | } | ||
482 | if (size + pos > DS1511_RAM_MAX + 1) { | ||
483 | size = DS1511_RAM_MAX - pos + 1; | ||
484 | } | ||
485 | rtc_write(pos, DS1511_RAMADDR_LSB); | ||
486 | for (count = 0; size > 0; count++, size--) { | ||
487 | rtc_write(*buf++, DS1511_RAMDATA); | ||
488 | } | ||
489 | if (count > 1) { | ||
490 | rtc_write((rtc_read(RTC_CMD) & ~DS1511_BME), RTC_CMD); | ||
491 | } | ||
492 | return count; | ||
493 | } | ||
494 | |||
495 | static struct bin_attribute ds1511_nvram_attr = { | ||
496 | .attr = { | ||
497 | .name = "nvram", | ||
498 | .mode = S_IRUGO | S_IWUGO, | ||
499 | .owner = THIS_MODULE, | ||
500 | }, | ||
501 | .size = DS1511_RAM_MAX, | ||
502 | .read = ds1511_nvram_read, | ||
503 | .write = ds1511_nvram_write, | ||
504 | }; | ||
505 | |||
506 | static int __devinit | ||
507 | ds1511_rtc_probe(struct platform_device *pdev) | ||
508 | { | ||
509 | struct rtc_device *rtc; | ||
510 | struct resource *res; | ||
511 | struct rtc_plat_data *pdata = NULL; | ||
512 | int ret = 0; | ||
513 | |||
514 | res = platform_get_resource(pdev, IORESOURCE_MEM, 0); | ||
515 | if (!res) { | ||
516 | return -ENODEV; | ||
517 | } | ||
518 | pdata = kzalloc(sizeof(*pdata), GFP_KERNEL); | ||
519 | if (!pdata) { | ||
520 | return -ENOMEM; | ||
521 | } | ||
522 | pdata->irq = -1; | ||
523 | pdata->size = res->end - res->start + 1; | ||
524 | if (!request_mem_region(res->start, pdata->size, pdev->name)) { | ||
525 | ret = -EBUSY; | ||
526 | goto out; | ||
527 | } | ||
528 | pdata->baseaddr = res->start; | ||
529 | pdata->size = pdata->size; | ||
530 | ds1511_base = ioremap(pdata->baseaddr, pdata->size); | ||
531 | if (!ds1511_base) { | ||
532 | ret = -ENOMEM; | ||
533 | goto out; | ||
534 | } | ||
535 | pdata->ioaddr = ds1511_base; | ||
536 | pdata->irq = platform_get_irq(pdev, 0); | ||
537 | |||
538 | /* | ||
539 | * turn on the clock and the crystal, etc. | ||
540 | */ | ||
541 | rtc_write(0, RTC_CMD); | ||
542 | rtc_write(0, RTC_CMD1); | ||
543 | /* | ||
544 | * clear the wdog counter | ||
545 | */ | ||
546 | rtc_write(0, DS1511_WD_MSEC); | ||
547 | rtc_write(0, DS1511_WD_SEC); | ||
548 | /* | ||
549 | * start the clock | ||
550 | */ | ||
551 | rtc_enable_update(); | ||
552 | |||
553 | /* | ||
554 | * check for a dying bat-tree | ||
555 | */ | ||
556 | if (rtc_read(RTC_CMD1) & DS1511_BLF1) { | ||
557 | dev_warn(&pdev->dev, "voltage-low detected.\n"); | ||
558 | } | ||
559 | |||
560 | /* | ||
561 | * if the platform has an interrupt in mind for this device, | ||
562 | * then by all means, set it | ||
563 | */ | ||
564 | if (pdata->irq >= 0) { | ||
565 | rtc_read(RTC_CMD1); | ||
566 | if (request_irq(pdata->irq, ds1511_interrupt, | ||
567 | IRQF_DISABLED | IRQF_SHARED, pdev->name, pdev) < 0) { | ||
568 | |||
569 | dev_warn(&pdev->dev, "interrupt not available.\n"); | ||
570 | pdata->irq = -1; | ||
571 | } | ||
572 | } | ||
573 | |||
574 | rtc = rtc_device_register(pdev->name, &pdev->dev, &ds1511_rtc_ops, | ||
575 | THIS_MODULE); | ||
576 | if (IS_ERR(rtc)) { | ||
577 | ret = PTR_ERR(rtc); | ||
578 | goto out; | ||
579 | } | ||
580 | pdata->rtc = rtc; | ||
581 | platform_set_drvdata(pdev, pdata); | ||
582 | ret = sysfs_create_bin_file(&pdev->dev.kobj, &ds1511_nvram_attr); | ||
583 | if (ret) { | ||
584 | goto out; | ||
585 | } | ||
586 | return 0; | ||
587 | out: | ||
588 | if (pdata->rtc) { | ||
589 | rtc_device_unregister(pdata->rtc); | ||
590 | } | ||
591 | if (pdata->irq >= 0) { | ||
592 | free_irq(pdata->irq, pdev); | ||
593 | } | ||
594 | if (ds1511_base) { | ||
595 | iounmap(ds1511_base); | ||
596 | ds1511_base = NULL; | ||
597 | } | ||
598 | if (pdata->baseaddr) { | ||
599 | release_mem_region(pdata->baseaddr, pdata->size); | ||
600 | } | ||
601 | |||
602 | kfree(pdata); | ||
603 | return ret; | ||
604 | } | ||
605 | |||
606 | static int __devexit | ||
607 | ds1511_rtc_remove(struct platform_device *pdev) | ||
608 | { | ||
609 | struct rtc_plat_data *pdata = platform_get_drvdata(pdev); | ||
610 | |||
611 | sysfs_remove_bin_file(&pdev->dev.kobj, &ds1511_nvram_attr); | ||
612 | rtc_device_unregister(pdata->rtc); | ||
613 | pdata->rtc = NULL; | ||
614 | if (pdata->irq >= 0) { | ||
615 | /* | ||
616 | * disable the alarm interrupt | ||
617 | */ | ||
618 | rtc_write(rtc_read(RTC_CMD) & ~RTC_TIE, RTC_CMD); | ||
619 | rtc_read(RTC_CMD1); | ||
620 | free_irq(pdata->irq, pdev); | ||
621 | } | ||
622 | iounmap(pdata->ioaddr); | ||
623 | ds1511_base = NULL; | ||
624 | release_mem_region(pdata->baseaddr, pdata->size); | ||
625 | kfree(pdata); | ||
626 | return 0; | ||
627 | } | ||
628 | |||
629 | static struct platform_driver ds1511_rtc_driver = { | ||
630 | .probe = ds1511_rtc_probe, | ||
631 | .remove = __devexit_p(ds1511_rtc_remove), | ||
632 | .driver = { | ||
633 | .name = "ds1511", | ||
634 | .owner = THIS_MODULE, | ||
635 | }, | ||
636 | }; | ||
637 | |||
638 | static int __init | ||
639 | ds1511_rtc_init(void) | ||
640 | { | ||
641 | return platform_driver_register(&ds1511_rtc_driver); | ||
642 | } | ||
643 | |||
644 | static void __exit | ||
645 | ds1511_rtc_exit(void) | ||
646 | { | ||
647 | return platform_driver_unregister(&ds1511_rtc_driver); | ||
648 | } | ||
649 | |||
650 | module_init(ds1511_rtc_init); | ||
651 | module_exit(ds1511_rtc_exit); | ||
652 | |||
653 | MODULE_AUTHOR("Andrew Sharp <andy.sharp@onstor.com>"); | ||
654 | MODULE_DESCRIPTION("Dallas DS1511 RTC driver"); | ||
655 | MODULE_LICENSE("GPL"); | ||
656 | MODULE_VERSION(DRV_VERSION); | ||